Bump supported Python interval to [3.10, 3.14] (#680)

Bumps Python versions to those currently supported and in production.

Updates from dropping 3.9 support:
* Using `|` for type hints instead of union/optional
* Use `strict=` flag for `zip()`.

Closes #635

---------

Co-authored-by: Theodore Turocy <ted.turocy@gmail.com>

Author: edwardchalstrey1

.devcontainer/devcontainer.json

@@ -3,7 +3,7 @@
   "features": {
     "ghcr.io/devcontainers/features/python:1": {
       "installTools": true,
-      "version": "3.11"
+      "version": "3.14"
     },
     "ghcr.io/devcontainers-contrib/features/gdbgui:2": {
       "version": "latest"

.github/workflows/lint.yml

@@ -47,7 +47,7 @@ jobs:
       - uses: actions/checkout@v5
       - uses: actions/setup-python@v6
         with:
-          python-version: "3.12"
+          python-version: "3.14"
       - uses: py-actions/flake8@v2
 
   cython-lint:
@@ -58,7 +58,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v6
         with:
-          python-version: "3.12"
+          python-version: "3.14"
       - name: Install Python packages
         run: python -m pip install cython-lint
       - name: cython-lint

.github/workflows/python.yml

@@ -10,7 +10,7 @@ jobs:
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
     strategy:
       matrix:
-        python-version: ['3.9', '3.13']
+        python-version: ['3.10', '3.14']
 
     steps:
       - uses: actions/checkout@v5
@@ -39,7 +39,7 @@ jobs:
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
     strategy:
       matrix:
-        python-version: ['3.13']
+        python-version: ['3.14']
 
     steps:
       - uses: actions/checkout@v4
@@ -63,7 +63,7 @@ jobs:
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
     strategy:
       matrix:
-        python-version: ['3.13']
+        python-version: ['3.14']
 
     steps:
       - uses: actions/checkout@v4
@@ -88,7 +88,7 @@ jobs:
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
     strategy:
       matrix:
-        python-version: ['3.13']
+        python-version: ['3.14']
 
     steps:
       - uses: actions/checkout@v5

.readthedocs.yml

@@ -8,7 +8,7 @@ formats: all
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.13"
+    python: "3.14"
   apt_packages:
     - libgmp-dev
     - pandoc

pyproject.toml

@@ -7,7 +7,7 @@ name = "pygambit"
 version = "16.4.0"
 description = "The package for computation in game theory"
 readme = "src/README.rst"
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 license = "GPL-2.0-or-later"
 authors = [
     {name = "Theodore Turocy", email = "ted.turocy@gmail.com"},
@@ -17,11 +17,11 @@ keywords = ["game theory", "Nash equilibrium"]
 classifiers=[
     "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Science/Research",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Programming Language :: Python :: Implementation :: CPython",
     "Topic :: Scientific/Engineering :: Mathematics"
 ]
@@ -41,7 +41,7 @@ Changelog = "https://github.com/gambitproject/gambit/blob/master/ChangeLog"
 [tool.ruff]
 line-length = 99
 indent-width = 4
-target-version = "py39"
+target-version = "py310"
 include = ["setup.py", "src/pygambit/**/*.py", "tests/**/*.py, doc/tutorials/*.ipynb"]
 
 [tool.ruff.lint]

src/pygambit/action.pxi

@@ -85,7 +85,7 @@ class Action:
         return Infoset.wrap(self.action.deref().GetInfoset())
 
     @property
-    def prob(self) -> typing.Union[decimal.Decimal, Rational]:
+    def prob(self) -> decimal.Decimal | Rational:
         """
         Get the probability a chance action is played.
 
@@ -108,7 +108,7 @@ class Action:
             return Rational(py_string.decode("ascii"))
 
     @property
-    def plays(self) -> typing.List[Node]:
+    def plays(self) -> list[Node]:
         """Returns a list of all terminal `Node` objects consistent with it.
         """
         return [

src/pygambit/behavmixed.pxi

@@ -81,7 +81,7 @@ class MixedAction:
     def __len__(self) -> len:
         return len(self.infoset.actions)
 
-    def __iter__(self) -> typing.Iterator[typing.Tuple[Action, ProfileDType], None, None]:
+    def __iter__(self) -> typing.Iterator[tuple[Action, ProfileDType], None, None]:
         """Iterate over the probabilities assigned to actions by the mixed action.
 
         .. versionadded:: 16.2.0
@@ -225,7 +225,7 @@ class MixedBehavior:
     def __len__(self) -> int:
         return len(self.player.actions)
 
-    def mixed_actions(self) -> typing.Iterator[typing.Tuple[Infoset, MixedAction], None, None]:
+    def mixed_actions(self) -> typing.Iterator[tuple[Infoset, MixedAction], None, None]:
         """Iterate over the mixed actions specified by the mixed behavior.
 
         .. versionadded:: 16.2.0
@@ -240,7 +240,7 @@ class MixedBehavior:
         for infoset in self.player.infosets:
             yield infoset, self[infoset]
 
-    def __iter__(self) -> typing.Iterator[typing.Tuple[Action, ProfileDType], None, None]:
+    def __iter__(self) -> typing.Iterator[tuple[Action, ProfileDType], None, None]:
         """Iterate over the probabilities assigned to actions by the mixed behavior.
 
         .. versionadded:: 16.2.0
@@ -257,8 +257,8 @@ class MixedBehavior:
 
     def __getitem__(
             self,
-            index: typing.Union[InfosetReference, ActionReference]
-    ) -> typing.Union[MixedAction, ProfileDType]:
+            index: InfosetReference | ActionReference
+    ) -> MixedAction | ProfileDType:
         """Access a component of the mixed behavior specified by `index`.
 
         Parameters
@@ -299,7 +299,7 @@ class MixedBehavior:
         )
 
     def __setitem__(self,
-                    index: typing.Union[InfosetReference, ActionReference],
+                    index: InfosetReference | ActionReference,
                     value: typing.Any) -> None:
         """Sets a component of the mixed behavior to `value`.
 
@@ -387,7 +387,7 @@ class MixedBehaviorProfile:
         """The game on which this mixed behavior profile is defined."""
         return self._game
 
-    def mixed_behaviors(self) -> typing.Iterator[typing.Tuple[Player, MixedBehavior], None, None]:
+    def mixed_behaviors(self) -> typing.Iterator[tuple[Player, MixedBehavior], None, None]:
         """Iterate over the mixed behaviors in the profile.
 
         .. versionadded:: 16.2.0
@@ -402,7 +402,7 @@ class MixedBehaviorProfile:
         for player in self.game.players:
             yield player, self[player]
 
-    def mixed_actions(self) -> typing.Iterator[typing.Tuple[Infoset, MixedAction], None, None]:
+    def mixed_actions(self) -> typing.Iterator[tuple[Infoset, MixedAction], None, None]:
         """Iterate over the mixed actions specified by the profile.
 
         .. versionadded:: 16.2.0
@@ -417,7 +417,7 @@ class MixedBehaviorProfile:
         for infoset in self.game.infosets:
             yield infoset, self[infoset]
 
-    def __iter__(self) -> typing.Iterator[typing.Tuple[Action, ProfileDType], None, None]:
+    def __iter__(self) -> typing.Iterator[tuple[Action, ProfileDType], None, None]:
         """Iterate over the probabilities assigned to actions by the profile.
 
         .. versionadded:: 16.2.0
@@ -434,8 +434,8 @@ class MixedBehaviorProfile:
 
     def __getitem__(
             self,
-            index: typing.Union[PlayerReference, InfosetReference, ActionReference]
-    ) -> typing.Union[MixedBehavior, MixedAction, ProfileDType]:
+            index: PlayerReference | InfosetReference | ActionReference
+    ) -> MixedBehavior | MixedAction | ProfileDType:
         """Access a component of the mixed behavior specified by `index`.
 
         Parameters
@@ -506,7 +506,7 @@ class MixedBehaviorProfile:
 
     def __setitem__(
             self,
-            index: typing.Union[PlayerReference, InfosetReference, ActionReference],
+            index: PlayerReference | InfosetReference | ActionReference,
             value: typing.Any
     ) -> None:
         """Sets a probability, mixed agent strategy, or mixed behavior strategy to `value`.

src/pygambit/gambit.pyx

@@ -74,14 +74,14 @@ def _to_number(value: typing.Any) -> c_Number:
     return c_Number(value.encode("ascii"))
 
 
-PlayerReference = typing.Union[Player, str]
-StrategyReference = typing.Union[Strategy, str]
-InfosetReference = typing.Union[Infoset, str]
-ActionReference = typing.Union[Action, str]
-NodeReference = typing.Union[Node, str]
+PlayerReference = Player | str
+StrategyReference = Strategy | str
+InfosetReference = Infoset | str
+ActionReference = Action | str
+NodeReference = Node | str
 NodeReferenceSet = typing.Iterable[NodeReference]
 
-ProfileDType = typing.Union[float, Rational]
+ProfileDType = float | Rational
 
 
 ######################